Leaf-miner:
Egg at the underside of the leaf, in the basal part, near the midrib.
The mine begins as a long, narrow, full depth gallery running towards
the leaf tip; frass here in a narrow central line. After the leaf
tip has been reached a large, full depth, brown blotch is made.
Much silk is deposited within, strongly contracting the mine and
making it opaque. Frass lies in big black lumps here either in the
oldest part, or in the centre, of the blotch. The larvae are capable
of leaving their mine and restarting elsewhere, in which case the
initial corridor is missing. Larvae of the first generation hibernate
in the mine. Pupation external, in a white spinning, often between
the leaves of the hostplant (Bladmineerders van Europa).

Larva: The larvae of moths have a head capsule and chewing mouthparts with opposable mandibles (see video of a gracillarid larva feeding), six thoracic legs and abdominal legs (see examples).

Distribution
in Great Britain and Ireland: Britain including Bedfordshire,
Derbyshire, East Gloucestershire, East Kent, East Suffolk, Glamorgan,
Herefordshire, North Essex, North Hampshire, North Somerset, North Wiltshire, South Wiltshire, Stafford, West Gloucestershire, West Norfolk, West Suffolk and Worcestershire (NBN
Atlas).